You start by running 5 km, move up to a 10 km, then a half marathon.

你先跑5公里，再跑10公里，然后跑半程马拉松。

youdao

It was finished in 2019, helping shorten the 18-km distance over the mountain to 5.7 km.

隧道于2019年竣工，将18公里的路程缩短至5.7公里。

youdao

In nine minutes, the probe had to reduce its speed from 20,000 km per hour to zero, landing from 125 km above Mars.

在9分钟内，探测器必须将速度从每小时2万公里降至零，从火星上空125公里处着陆。

youdao

There's no big city within 200 km, but tourists from all over the world manage to find it.

VOA: standard.2010.03.29

Then, I tell you I went for 5 km on the second day and another 5 km on the third day.

然后我第二天行进了5公里,第三天又走了5公里

耶鲁公开课 - 基础物理课程节选

You can deal with this by saying not just 5 km, but plus or minus 5 km.

你不能只说5公里,而应该是+5或者-5公里

耶鲁公开课 - 基础物理课程节选

The Gloucestershire zone covers 300 sq km, while the Somerset pilot zone is 250 sq km.

BBC: Cull 'not good deal' for taxpayer, says UK expert

Singapore is to extend its 83 km of mass-rail lines by another 20 km.

CNN: The Best Transport

We share a 1, 000-km-long border with India and a 2, 400-km-long border with China.

CNN: ASIANOW - TIME Asia | Interview: Foreign Minister Win Aung - Page 1